锂二次电池聚吡咯基复合正极材料的研究

以聚吡咯 /二氧化硅 (炭黑 )〔PPy/SiO2 (C)〕复合材料作正极 ,组装成锂 /聚吡咯二次电池。探讨了不同掺杂材料、充放电电流对该电池性能的影响。结果表明 ,复合材料电导率越高、充放电电流越小 ,电池容量越高 ,循环性能越好 ;其中PPy/APS SiO2 电导率最高为 3 3 3S/cm ,当充放电电流为 0 1mA时 ,电极最大放电比容量达到41 89mA·h/g ,经 3 0个充放电循环后 ,充放电效率仍为 98 2 %。通过元素分析和SEM研究了经充、放电后正极材料的组成和形态结构的变化 ,验证了锂 /聚吡咯二次电池的工作原理 ,是靠阴离子掺杂和脱掺杂进行的

Study of Polypyrrole Composites as Anode of Secondary Lithium Battery

Secondary lithium batteries were made and tested using polypyrrole/silica (carbon black) as anode. Influences of different dopants and charge-discharge currents on battery properties were studied.The results showed that the capacity and recycling properties of battery were turned better with the increase of conductivity of the composite and the lowering of charge-discharge current.Among the composites the conductivity of PPy/APS-SiO_2 was the highest,being 33.3 S/cm.When the charge-discharge current was 0.1 mA,the specific capacity of PPy/APS-SiO_2 was 41.89 mA·h/g,and the recycling efficiency was still 98.2% after thirty cycles.The change of structure and components of the anode was also studied through elementary analysis and SEM,and it is verified that the working principle of lithium/PPy secondary battery is doping and disdoping of anions.